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by wolfgke
4025 days ago
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As long as the styrofoam gets bent/compressed (but does not break), it takes a lot of energy from the fall. As soon as it breaks, it can't absorb much energy anymore, thus it impacts your head a lot more. That's the reason, why after a crash the helmet should be replaced, whether there can be seen damages or not (the shell internally breaks when it absorbs energy this way, but this can hardly be seen (except when, say, you use X-ray analysis or something similar). |
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But it has still absorbed the energy that it took to crack the helmet. If the strength of the impact is exactly the same as the strength of the helmet, then the helmet will simply crack, and leave your skull intact. However if you're not wearing the helmet, your head receives the full force of the impact.